(fix #248) follow directory links in getNode

When called from `stat`, `getNode` should follow directory links to
ensure that the correct node is returned. Otherwise, `node.files[name]`
will be `undefined`, causing a `TypeError`.

lib/filesystem.js

@@ -131,9 +131,13 @@ class Filesystem {
     return files
   }
 
-  getNode (p) {
+  getNode (p, followLinks) {
+    followLinks = typeof followLinks === 'undefined' ? true : followLinks
     const node = this.searchNodeFromDirectory(path.dirname(p))
     const name = path.basename(p)
+    if (node.link && followLinks) {
+      return this.getNode(path.join(node.link, name))
+    }
     if (name) {
       return node.files[name]
     } else {
@@ -143,7 +147,7 @@ class Filesystem {
 
   getFile (p, followLinks) {
     followLinks = typeof followLinks === 'undefined' ? true : followLinks
-    const info = this.getNode(p)
+    const info = this.getNode(p, followLinks)
 
     if (!info) {
       throw new Error(`"${p}" was not found in this archive`)